I first met Don Helmberger when I visited Caltech in the spring of 1984 as a prospective graduate student.During that visit,I was immediately impressed by Don’s unbridled passion for science,in general,and seismology,in particular.Don made me feel quite at ease as we discussed mantle triplications,core phases and ray theory.Never mind that most of it was well above my head,he patiently continued the discussion while answering my many questions.Then he showed me a paper that literally changed my life:Theory and Application of Synthetic Seismograms(Helmberger,1983).
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